Proposal for management and alkalinity transformation of bauxite residue in China

Xue, S., Kong, X., Zhu, F., Hartley, W., Li, X. and Li, Y. (2016) Proposal for management and alkalinity transformation of bauxite residue in China. Environmental Science and Pollution Research, 23 (13). pp. 12822-12834.

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Bauxite residue is a hazardous solid waste produced during the production of alumina. Its high alkalinity is a potential threat to the environment which may disrupt the surrounding ecological balance of its disposal areas. China is one of the major global producers of alumina and bauxite residue, but differences in alkalinity and associated chemistry exist between residues from China and those from other countries. A detailed understanding of the chemistry of bauxite residue remains the key to improving its management, both in terms of minimizing environmental impacts and reducing its alkaline properties. The nature of bauxite residue and the chemistry required for its transformation are still poorly understood. This review focuses on various transformation processes generated from the Bayer process, sintering process, and combined Bayer-sintering process in China. Problems associated with transformation mechanisms, technical methods, and relative merits of these technologies are reviewed, while current knowledge gaps and research priorities are recommended. Future research should focus on transformation chemistry and its associated mechanisms and for the development of a clear and economic process to reduce alkalinity and soda in bauxite residue.

Item Type: Article
Keywords: Alkalinity transformation, Amelioration, Bauxite residue, Chemical mechanism, Neutralization, Waste management
Divisions: Crop and Environment Sciences
Depositing User: Ms Kath Osborn
Date Deposited: 12 May 2017 13:59
Last Modified: 19 Jan 2018 11:29

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